81070272 has 84 divisors (see below), whose sum is σ = 234930696. Its totient is φ = 26726400.

The previous prime is 81070261. The next prime is 81070273. The reversal of 81070272 is 27207018.

It is not an unprimeable number, because it can be changed into a prime (81070273) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 55147 + ... + 56597.

It is an arithmetic number, because the mean of its divisors is an integer number (2796794).

Almost surely, 2^81070272 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 81070272, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (117465348).

81070272 is an abundant number, since it is smaller than the sum of its proper divisors (153860424).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

81070272 is a wasteful number, since it uses less digits than its factorization.

81070272 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1566 (or 1553 counting only the distinct ones).

The product of its (nonzero) digits is 1568, while the sum is 27.

The square root of 81070272 is about 9003.9031536329. The cubic root of 81070272 is about 432.7999580886.

The spelling of 81070272 in words is "eighty-one million, seventy thousand, two hundred seventy-two".